Crossbelts are not for line infantry, however you could consider using these figures as light infantry in great coats, they seem to have the infantry saber. Epaulettes were at a certain time exclusively reserved for the elites. That light infantry continued to wear them, was much to the little big man's dismay. Perhaps these units kept the swords and especially on the greatcoats, compromised on the epaulettes. Headgear is not a problem either, en route plumes were usually removed. Paint the pompoms either red or yellow or dark green and you might get a decent representation of light infantry. Alternatively, there is milliput to play with.